Submit batched transactions

You can use the batch transaction request. At the time of this writing batch transactions will always be submitted as an atomic jito bundle. That means either all of them succeed and land or none of them.

var NextblockTipWallets = solana.PublicKeySlice{
	solana.MustPublicKeyFromBase58("NEXTbLoCkB51HpLBLojQfpyVAMorm3zzKg7w9NFdqid"),
	solana.MustPublicKeyFromBase58("nextBLoCkPMgmG8ZgJtABeScP35qLa2AMCNKntAP7Xc"),
	solana.MustPublicKeyFromBase58("NextbLoCkVtMGcV47JzewQdvBpLqT9TxQFozQkN98pE"),
	solana.MustPublicKeyFromBase58("NexTbLoCkWykbLuB1NkjXgFWkX9oAtcoagQegygXXA2"),
	solana.MustPublicKeyFromBase58("NeXTBLoCKs9F1y5PJS9CKrFNNLU1keHW71rfh7KgA1X"),
	solana.MustPublicKeyFromBase58("NexTBLockJYZ7QD7p2byrUa6df8ndV2WSd8GkbWqfbb"),
	solana.MustPublicKeyFromBase58("neXtBLock1LeC67jYd1QdAa32kbVeubsfPNTJC1V5At"),
	solana.MustPublicKeyFromBase58("nEXTBLockYgngeRmRrjDV31mGSekVPqZoMGhQEZtPVG"),
}

func GetRandomNextblockTipWallet() solana.PK {
	randVal := rand.IntN(len(NextblockTipWallets))
	return NextblockTipWallets[randVal]
}

func BuildAndSendBatchTransaction() error {
	pk := solana.MustPrivateKeyFromBase58("<signer private key>")
	// rpcClient cli has to be initialized somewhere 
	// there are also other ways of retrieving latest blockhash / using nonce accounts
	bh, _ := cli.GetLatestBlockhash(context.TODO(), rpc.CommitmentFinalized)
	txBuilder := solana.NewTransactionBuilder()
	txBuilder.SetFeePayer(pk.PublicKey())
	txBuilder.SetRecentBlockHash(bh.Value.Blockhash)
        // add tip instruction
	txBuilder.AddInstruction(
		system.NewTransferInstruction(1000000, pk.PublicKey(), GetRandomNextblockTipWallet()).Build(),
	)
	// add a dummy transfer instruction of 10000 lamports
	// this should be replaced with useful instructions...
	txBuilder.AddInstruction(
		system.NewTransferInstruction(uint64(10000), pk.PublicKey(), solana.MustPublicKeyFromBase58("<receiving publickkey>")).Build(),
	)
	tx, err := txBuilder.Build()
	if err != nil {
		return err
	}
	_, err = tx.Sign(func(key solana.PublicKey) *solana.PrivateKey {
		return &pk
	})
	if err != nil {
		return err
	}
	// nextblockApiClient has to be initialized and in scope
	// it currently has no additional parameters as it will always be sent as a jito bundle
	submitResponse, err := nextblockApiClient.PostSubmitBatchV2(context.TODO(), &api.PostSubmitBatchRequest{
		Entries: []*api.PostSubmitRequestEntry{
			{
				Transaction: &api.TransactionMessage{Content: base64EncodedTransaction},
			},
			{
				Transaction: &api.TransactionMessage{Content: base64EncodedTransaction},
			},
		},
	})
	if err != nil {
		fmt.Println(err)
		return
	}
	fmt.Println(submitResponse)
}